OUR CHANGING EARTH

LITHOSPHERIC PLATES the earth's crust is made up of many large and same small, rigid, irregularly shaped plates. These are like slabs that hold up the continents and the ocean floor. These are called lithospheric plates.
ENDOGENIC FORCES AND EXOGENIC FORCES
Th force which occur in the interior of the earth are called endogenic forces. And the forces which are generated on the surface of the earth are called exogenic force. Endogenic forces sometimes produce sudden motion and sometimes slow motion .
             

VOLCANO 
1. Volcano are openings in the earth's crust that spew lava,ash and gases when tectonic plates move, they creat cracks in the earth's crust that allow magma to move the surface.
2. Volcano can be seen on lond or below the ocean, and can range in size from small vents to lorge mountain.
3. There are different types of volcanoes. Active volcanoes are those that have either erupted recently or are expected to do so in the near future.
4. Dormant volcanoes are those that have not erupted for a long time extinct volcanoes no longer erupt rivers.

EARTHQUAKE 
1. An earthquake is a sharp, violent vibration of the earth surface that occurs when energy stored in rocks or plates below the surface is released.
2.when rocks break or move the energy is released or seismic waves that move through the earth and shake the ground.
3.earthquakes can range from small tremors to large tremors and can cause a lot of damage.
4. they can accur anywhere on earth and people thousands of miles from the earthquakes origin or epicenter can feel the effects.


The EPICENTER is  the point on the earth's or another planet's surface directly above the starting point of an earthquake or underground nuclear explosion.
The location below the surface where the earthquake or explosion began is called the hypocentre .
 


WORK OF A RIVER 
The work of flowing water is the most important exogenous process on earth. Landforms created by rivers depend on velocity and quantity of erosive tools largely determine the nature and magnitude of erosion.



WORK OF SEA WAVES 
Coastal erosion is the loss of coastal land due to the action of sea waves. As sea waves hit the beach they release tremendous amount of energy that erodes and reshapes the land           



WORK OF ICE
Glaciers are "rivers of ice "that erade the landscape by bulldozing away solid rock underneath. glaciers create deep pits and as the ice melts, they get filled with water and beautiful lakes are formed in the mountains by glaciers.




WORK OF WIND
Mushroom shaped rock can be seen in the desert which are commonly called mushroom rocks.the wind erodes the lower part of the rock more than the upper part. So the upper part of the rocks is wide and when the wind blows,it takes the sand from one place to another and when the wind stops blowing, the sand falls down and gets deposited in low hill like structures . when the sand particles are very light and very fine, the wind can Corry them to long distances . when such sand gets deposited in a large deposits of loess are found in china .






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